How does someone shift from educational training to consultant field after 16 years?

He must adapt itself to the new work because I love what wisdom says working to do what you love

Thanks for the invite, I apologize for the answer, I leave the answer for the professionals in this field

If the area of consulting is education or training then it should be an easy and smooth shift. Since he/she has 16 years in that field, they'd know the ins and outs of it, the dos and don'ts, the tricks of the trade, so they can use that in their consulting. I recommend the work of Alan Weiss "Million Dollar Consulting". Alan wrote many other books about consulting and they are considered the blue print for any new or seasoned consultant. 

I agree with specialties answers. Thanks for the invitation. 

it is dependent on his flexibility to see the different and fix gap between training and consultant